276353 (2002 UY20) vs 57202 (2001 QJ53)

276353 (2002 UY20) vs 57202 (2001 QJ53)

Same approach described in the previous posts.

276353 (2002 UY20)

Classification: Main-belt Asteroid          SPK-ID: 2276353

[ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]

Orbital Elements at Epoch 2458000.5 (2017-Sep-04.0) TDB Reference: JPL 8 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1562105639420963 6.3914e-08 a 2.337601777404309 2.6617e-08 au q 1.972443685483935 1.5861e-07 au i 4.252343536114911 6.8871e-06 deg node 23.41388838094758 0.0001045 deg peri 35.95235952421835 0.00010784 deg M 38.09017324814934 2.7256e-05 deg tp 2457862.377424660816 (2017-Apr-18.87742466) 9.8187e-05 JED period 1305.431897045054 3.57 2.2296e-05 6.104e-08 d yr n .2757708010773199 4.7101e-09 deg/d Q 2.702759869324683 3.0775e-08 au

Orbit Determination Parameters    # obs. used (total)      115      data-arc span      5111 days (13.99 yr)      first obs. used      2002-10-28      last obs. used      2016-10-25      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      fit RMS      .70803      data source      ORB      producer      Otto Matic      solution date      2017-Apr-10 16:21:05   Additional Information  Earth MOID = .986707 au   Jupiter MOID = 2.62843 au   T_jup = 3.546

57202 (2001 QJ53)

Classification: Main-belt Asteroid          SPK-ID: 2057202

[ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]

Orbital Elements at Epoch 2458000.5 (2017-Sep-04.0) TDB Reference: JPL 17 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1557724906162496 4.4578e-08 a 2.338080038545681 1.0974e-08 au q 1.973871487681283 1.03e-07 au i 4.250626760813153 5.0566e-06 deg node 23.42499161765863 6.5966e-05 deg peri 36.16096420351912 6.8003e-05 deg M 103.6361139081139 1.6156e-05 deg tp 2457624.579415793553 (2016-Aug-24.07941579) 5.793e-05 JED period 1305.832544380318 3.58 9.1935e-06 2.517e-08 d yr n .275686190813109 1.9409e-09 deg/d Q 2.702288589410078 1.2683e-08 au

Orbit Determination Parameters    # obs. used (total)      743      data-arc span      16797 days (45.99 yr)      first obs. used      1971-03-25      last obs. used      2017-03-20      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      fit RMS      .57656      data source      ORB      producer      Otto Matic      solution date      2017-Apr-11 18:07:27   Additional Information  Earth MOID = .988199 au   Jupiter MOID = 2.62768 au   T_jup = 3.546

Simulation Results (note, Time 0 is JD 0 --> 4713 B.C.)

Kind Regards,
Alessandro Odasso

Asteroid H mag vs perihelium - ternary maps

Inspired by these beautiful examples, I have tried to use the ggtern R package to draw a few ternary maps showing how the H mag of various asteroid families varies as a function of q, i.e. the perihelium distance.

As usual, the starting point ...

11842 Kap'bos (1987 BR1) vs 436415 (2011 AW46)

11842 Kap'bos (1987 BR1) is an interesting asteroid indeed!

First of all, looking at proper elements (see this page), this asteroid has already been recognized to be associated to (228747) 2002 VH3

Furthermore, but this is not sure, it may be even more strictly associated to 436415 (2011 AW46)

JPL Small-Body Database Browser

11842 Kap'bos (1987 BR1)
Orbital Elements at Epoch 2457200.5 (2015-Jun-27.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)

Element	Value	Uncertainty (1-sigma)	Units
e	.09426143976452217	5.4457e-08
a	2.250221196226988	1.1502e-08	AU
q	2.038112106481987	1.1993e-07	AU
i	3.688461615022471	5.8652e-06	deg
node	272.8444791596755	7.5115e-05	deg
peri	172.3596586176659	8.1653e-05	deg
M	181.7294574254017	3.145e-05	deg
tp	2457811.038885071140 (2017-Feb-26.53888507)	0.00010929	JED
period	1232.923821576616 3.38	9.4533e-06 2.588e-08	d yr
n	.2919888428626886	2.2388e-09	deg/d
Q	2.462330285971989	1.2586e-08	AU

436415 (2011 AW46) 
Orbital Elements at Epoch 2457200.5 (2015-Jun-27.0) TDB
Reference: JPL 8 (heliocentric ecliptic J2000)

Element Value Uncertainty (1-sigma)   Units  e .09435201650783409 1.8231e-07   a 2.25006679453928 5.9552e-08 AU q 2.03776845519718 4.095e-07 AU i 3.688904837606787 1.5844e-05 deg node 272.8087674388969 0.00022201 deg peri 172.3636156199904 0.0002396 deg M 151.7058568204286 9.5288e-05 deg tp 2456680.993016870443 (2014-Jan-23.49301687) 0.00031517 JED period 1232.7969258828 3.38 4.8942e-05 1.34e-07 d yr n .2920188981994789 1.1593e-08 deg/d Q 2.462365133881379 6.5171e-08 AU

This is the result of a simulation made with Mercury6 software (graphs made with package R):

Looking at nominal parameters, it seems that these two asteroids had a very close encounter (nearly 9000 km) with a relative velocity of about 30 cm/s about 11500 years ago.

I do not know whether this is true and, if yes, whether this is just a coincidence or these two asteroids separated in that moment from a common body.

Kind Regards,
Alessandro Odasso